USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
9
Pool Chemistry
The table below summarizes the levels that are recommended by The Association of Pool and Spa
Professionals (APSP). It is important to maintain these levels in order to prevent corrosion or scaling
and to ensure maximum performance from your AQR100 chlorine generator. Your authorized AQR100
dealer or most pool stores can provide you with the chemicals and procedures to adjust the water
chemistry as well.
Note that pool water emanating from wells and municipal water supplies, along with the introduction
of environmental contaminants, can contain chemistries that are deleterious to the life expectancy
of the Cell.
Salt 1500 to 4500 ppm (3200 ideal)
Free Chlorine 1.0 to 3.0 ppm
pH 7.2 to 7.8
Cyanuric Acid
(Stabilizer)
Outdoor Pools 30-50 ppm
Indoor Pools - 0 ppm
Total Alkalinity 80 to 120 ppm
Calcium Hardness 200 to 400 ppm
Metals 0 ppm
Saturation Index -.2 to .2 (0 best)
Saturation index
The saturation index (Si) relates to the calcium and alkalinity in the water and is an indicator of the
pool water “balance”. Your water is properly balanced if the Si is 0 ± 0.2. If the Si is below -0.2,
the water is corrosive and plaster pool walls will be dissolved into the water. If the Si is above +0.2,
scaling and staining will occur. Use the chart below to determine the saturation index.
Si = pH + Ti + Ci + Ai - TDS
Hardness
Calcium
75
100
125
150
200
250
300
400
600
800
Total Dissolved
Solids
Total
alkalinity
°C °F Ti Ci Ai TDS
12
16
19
24
29
34
39
53
60
66
76
84
94
102
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.4
2.5
75
100
125
150
200
250
300
400
600
800
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.8
2.9
0-1000
1001-2000
2001-3000
3001-4000
4001-5000
12.10
12.29
12.35
12.41
12.44
Use: Measure the pH of the pool water, the temperature, water hardness, total alkalinity,
and total dissolved solids. Use the table above to determine Ti, Ci, Ai, and TDS in the
formula shown above. If the Si is equal to 0.2 or more, stains may appear. If the Si is
equal to -0.2 or less, corrosion or deterioration may occur.
Corrosion Stain
Ok
-0.2 0.2
CHEMICAL IDEAL LEVELS
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